Summary: when feeding a baby cow or baby chicken it doesn't grow up.
Steps to reproduce:
Feed a baby animal, one stack of food (varies per animal)
Expected results: in each time growth should be accelerated by 10%. After the 10th time should be grown up according to wiki and normal behaviour in Java or Bedrock
Observed Results: nothing happens
Iirc it's multiplicative, not incremental. After 10 feeds it's thus 65% sped up; after 64 it's 99% sped up; but you still need to wait a tiny bit longer for it to fully grow.